Oops I read your post wrong... Sorry about that. I have an extra NPC Polaroid pack film back that takes the Fuji100 film that is the smaller kind, not the 4x5 size.
I can give it to you cheap, I took the back off, so it's just the plastic part but will work great for Halcking a 4x5 setup
Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1, 5DmkII / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic | Sent w/ iPhone using Tapatalk